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11

Breaking in Your Engine

The first start-up of the engine is the most critical 
moment of the engine’s life, dictating how the 
engine will perform from that time forward. Turn 
on your radio system and attach a fully charged 
glow igniter (DYN1925) to the glow plug. Start 
the engine with the electric starter as described in 
Section 8.

During break-in, the low-speed needle should be 
slightly rich and the high speed needle should be 
very rich. After a few tanks of fuel, begin to lean the 
engine out. It generally takes about five to six tanks 
of fuel before you want to lean out the engine until 
it supplies good power. Do not skip this process 
of break-in. Failure to follow this procedure could 
damage your new engine. For further details on 
breaking in your engine, please see the separate 
Dynamite .32 instruction manual.

Note

: It is common for an ABC 

engine to go through a glow plug or 
two during break-in.

Needle Settings

When adjusting the settings, always adjust the 
needles in small increments, about 1⁄16 of a full 
turn at a time. Do not set the engine too lean, as it 
shortens the reliability of the engine.

After you have attained the correct needle settings, 
the engine will have a strong sounding, high-pitched 
whine at full speed, and a thin trail of blue/white 
smoke will come from the exhaust.

Idle Adjustment

The last setting to set is the idle screw. To obtain a 
higher idle, turn the idle screw clockwise; for lower 
idle, turn the idle screw counterclockwise.

Replacement Parts

In the event that you need to replace an engine 
part, there is a complete parts listing in the 
Dynamite .32 instruction manual. Exploded views 
will help you to select the correct parts and make 
minor repairs.

Head Shims

Several head shims are added at the factory to make 
the engine easier to start when new. After break-
in, you may remove all but one of theses shims to 
increase compression and power.

Maintenance

Lube the gears inside the drive with waterproof 
grease every 30 hours of use. Check all screws for 
tightness after each run.

Section 10: Starting the Engine (continued)

Summary of Contents for ThunderCat 31

Page 1: ...5mm Beam 11 5 in 287mm Engine DYN 32 Marine w Tiger Drive and Tuned Exhaust Radio System Pro Boat AM 27MHz Weight 6 3 lb 2 8 kg Fuel Tank Capacity 12 oz 0 35 liter ThunderCat 31 Assembly Manual 32 Siz...

Page 2: ...ear If someone else is operating on the same frequency both models could go out of control possibly causing damage to the models as well as to others Be certain to check all of the hardware exhaust sy...

Page 3: ...32 Marine Engine 9 Section 10 Starting the Engine 10 Section 11 Troubleshooting Guide 12 Section 12 Maintenance 12 Section 13 ThunderCat 31 Replacement Parts 14 Section 14 Appendix 15 Engine Tuning Sc...

Page 4: ...ser accepts all resulting liability All warranty questions should be directed to Horizon Hobby Inc Please do not contact your local hobby shop regarding warranty issues This will enable Horizon to bet...

Page 5: ...he short plywood pieces Repeat with the remaining short plywood pieces 3 Secure the interlocking boat stand with thick CA or Epoxy Parts Needed Rudder and 2 5mm hex screw 1 Locate the stainless steel...

Page 6: ...e dry cell battery holder Install 4 AA alkaline batteries as shown Note the proper polarity Wrap the battery box in foam 4 Re install the battery holder into the radio box and and secure the radio box...

Page 7: ...tter 3 Note the proper polarity and insert 8 AA batteries into the transmitter 3 Secure the batteries using the battery cover 4 Turn on the radio and confirm that all LEDs illuminate indicating proper...

Page 8: ...and re installed the lid wipe away any excess fuel that may have spilled inside the hull or elsewhere on the boat Immediately seal the fuel container by putting the lid back on after refueling in ord...

Page 9: ...ing through the engine head If the water does not reach the head to cool it the engine will overheat and fail This will cause permanent damage to the engine Carburetor High Speed Needle Valve Faster I...

Page 10: ...dition as serious engine damage may occur if operation is continued Remove the glow plug invert the boat and operate starter to remove raw fuel before resuming normal operation You may have to blip th...

Page 11: ...usting the settings always adjust the needles in small increments about 1 16 of a full turn at a time Do not set the engine too lean as it shortens the reliability of the engine After you have attaine...

Page 12: ...per glow plug install proper glow plug Glow igniter not charged charge igniter Dead glow plug replace Flooded engine remove glow plug invert boat and engage the Tiger Drive to remove raw fuel from the...

Page 13: ...ortant so that when you have finished lubricating the drive shaft you can correctly re install the drive shaft Loosen do not remove the retaining nut by holding the collet with a 17mm wrench and unscr...

Page 14: ...ut TC31 PRB2072 Exhaust Coupler TC31 PRB2073 Rubber Boot 2 TC31 PRB2075 Antenna Tube TC31 PRB2079 Collet TC31 PRB2080 Teflon Liner TC31 PRB2083 Cockpit Bolt TC31 PRAB215 Propeller 1 60 x 2 5 Bronze TC...

Page 15: ...15 Section 14 Appendix Engine compartment and components Transom and components Engine water cooling lines...

Page 16: ...8379 2006 Horizon Hobby Inc 4105 Fieldstone Road Champaign Illinois 61822 877 504 0233 www horizonhobby com Printed in China...

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